PowerPoint Slideshow about 'Renal Stone' - briana

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at a urine pH of 5.0 (a setting in which most of the uric acid is the insoluble intact acid)

the incidence of stone formation varies with the rate of uric acid excretion, ranging from 10 to 20 percent when urinary uric acid excretion is normal (upper limit of normal equals 800 mg [4.8 mmol] in men and 750 mg [4.5 mmol] in women) to as high as 40 to 50 percent when uric acid excretion exceeds 1000 mg/day (6 mmol/day) .

2- non contrast helical CT scan due to higher sensitivity and specificity than IVP and US , suggest the initial diagnostic study of choice in most cases , and is faster than IVP and slightly more expensive ($ 600 vs $ 400 ). If helical CT is not available , IVP or US are appropriate .

low bicarb : type 1 RTA . Ca measured on 2 or 3 occasions ,if high NL (10.2- 11) , or urine Ca is high : intact PTH should measured, since Primary HP is often associated with inttermi. or mildly elevated plasma Ca . PHP suspected in women , since PHP is more common in women , whereas 80% of formers of idiopathic stones are men .